<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>h1标签</title>
</head>
<body>
    <h1>这是H1标签</h1>
    <h2>这是H2标签</h2>
    <h3>这是H3标签</h3>
    <h4>这是H4标签</h4>
    <h5>这是H5标签</h5>
    <h6>这是H6标签</h6>
</body>
</html>